perfidious

(pər-fĭd'ē-əs)
adj.
Of, relating to, or marked by perfidy; treacherous. See synonyms at faithless.

perfidiously per·fid'i·ous·ly adv.

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adjective

Not true to duty or obligation: disloyal, faithless, false, false-hearted, recreant, traitorous, treacherous, unfaithful, untrue. See continue/stop/pause, trust/distrust.

adj

Definition: treacherous
Antonyms: faithful, loyal

faithless, disloyal: treacherous

For a list of words related to perfidious, see:

• Bad, False, Evil, Insincere, or Dishonest

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See words rhyming with "perfidious."